Y. Xu
Beijing Normal University
China

Yan Xu — Ph.D. in Economics, Professor, School of Economics and Business Administration

19, Xinjiekouwai str., Haindian District, Beijing, People’s Republic of China, 200044

D. Liu
China University of Labor Relations
China

Dun Liu — Ph.D. in Economics, Lecturer of School of Economics and Management

45, Zengguang rd., Haidian District, Beijing, People’s Republic of China, 100048